Mold for combination heels



Aug. 2, 1927.

1,637,441 L. B- CQNANT MOLD FOR COMBINATION HEELS 7 Original Filed July 12, 19216 Q 'u&\\ w W93 Z J x H 7 5" i K 6 V a 6 p/ I f Fi .1 1 z 6 I y I Leo n13. Conan/Li 21 Patented Aug. 2, 1927.

UNITED STATES PATE T OFFICE- LEON B. ooNANT, F CAMBRIDGE, MASSACHUSETTS, AssIeNoR TO GEORGE M. CONANT, J I or BRIDGEWATER, MASSACHUSETTS.

I MOLD ron COMBINATION HEELS.

Applicationfiled July 12. 1926, Serial No. 121,958; 1 Renewed Apri1'28, 1927.

This invention relates to the moldsin which a rubber tread is vulcanized to a fibre base; and it has for its objects, first,

the reduction in the cost of producing the 5 molds; second, the effecting of means for adapting the same mold for different thick:

improvement,fI provide the backplate with ward inclination which removable stops, which, by their descent upon the centr'eplate, limit the compression of the base; and for the third improvement,

. I give the basesupportingshoulder a downfrom cutting into the base.

In the drawings forming part of this specification, Fig. 1 is a cross section of the 7 com lete mold. Fi e 2 isa lan view of P e P the centreplate thereof. Fig. 3 is a cross section of the centreplate designed for a pre-shaped base. g

As shown in Fig. 2, the centreplate 1 is formed with a cavity 2 shaped for properly molding the rubber tread; the face plate supporting the same being shown in Fig. 1. This centreplate has its upper surface flush I with the shoulder 3upon which the edge of the heel base 8 is to rest. Previous to this,

invention, the shoulderwas made entirely flat and wlth a right-angled edge. This I have discovered was a very faulty construction, for the reason that such sharp edge during the process of vulcanization, was so forced intothe leather by the heavy pres-' I sure incidenttothe process, as to impart rising from the centreplate spaced from the heat thereto more extremely than elsewhere, and thereby to char theleather and frequently ruining the bases. But, by having the shoulder slope downward toward the interior of the mold to coincide with the curvature given to the under surface of the heel base, all suchinjurious effects were entirely avoided.

I prefer not to extend thecentreplate f above the level of the shoulder 3 as is shown in Fig. 3, butto position the heel bases thereon by means of a series of pins 4 rising from the centreplate, as shown in Figs 1 and 2; the dotted line in Fig. 2 indicatingthe prevents its edge edge ofa heel base. It is evidently far less expensive to dr ll a. few holes in the centreplate and to drive pins therein, than it is to form the. type of centreplate shown in Fig. 8.. f

To facilitate the introduction of the heel. bases into the centreplate, the surfaces of the pins 4 are filed away on the sides adjacent the shoulder 3 in order to have them flare outwardly, as shown in Fig. 1. In case the centreplate is formed as illustrated .in Fig. 3, its surfaces adjacent the shoulder 8 are also made to flare outwardly. This figure shows a preshaped heel base located therein, as 9.

' Because of the heavy pressure required in theprocess of vulcanization, it is unwise to limit the descent of the, backplate by the pins 1-, for the reason that the latter would soon become flattened and injured thereby. Therefore, strips 6 are attachedto the upper surface of the centreplate or to the under 1 surface of the backplate, but preferably to latter, as shown in F 1, screws 7 being used as the means of such attachment. thus having the strips removable, thinner or thicker ones can be substituted for the purpose ofadapting the same mold for different types and styles of heel bases.

What I claim as my invention is:

1. A mold for combination heels, comprisinga centreplate having a shoulder flush withthe upper surface thereof, a backplate co-operating therewith, and means for po- SltlOIllIlg a heel base relative to the centreplate, said positioning means consisting of pins projecting from one of said plates. 2. A mold for combination heels, comprising a centreplate having a shoulder flush with the upper surface thereof, a backplate co-operating therewlth, and a series of pins edge of the shoulder for bases thereon.

3. A mold for combination'heels, comprispositioning the heel ing a centreplate having a shoulder flush .Wliill its upper surface, means for position ing the heel bases relative to said shoulder,

a backplate,'and means for limiting the the centreplate for positioning the heel bases thereon, a backplate, and means for limiting jun with its upper surface, pins projecting from I the descent of the latter consisting of strips removablyattached to one of the adjacent surfaces of the centreplate and baclrplate.

5 Ainold for combination heels, com ing a centreplate having a shoulder flush with its upper surface, pins "rising from the centreplate spaced from said shoulder,

a hackplate, and strips removably attached to the latter, themeans Ot'attachment con'-.:

sisting of screws penetrating the backplate and strip. i H

6. A mold for combinationheels, comprising a centreplate having a shoulder for the support of the edges of the heel bases, means 15 for centering the bases thereon, and a backplate, said shoulder sloping downward toward'the interior of the mold.

V 1. A mold tor combination heels, compr1sing a centreplate having a shoulder for the so 3' )ort of the ed es of the reel bases means LEON B. CONAST. 

